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Employee Benefit Plans (Fair Value of Plan Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets   $ 630.7  
Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets   490.0  
Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets   0.0  
Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets   24.1  
Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets $ 601.7 $ 630.7 $ 677.2
Percentage of fixed income securities consisting of investment-grade corporate bonds 19.00% 45.00%  
Percentage of fixed income securities consisting of high-yield securities 13.00%    
Percentage of fixed income securities consisting of government treasuries 25.00% 32.00%  
Percentage of fixed income securities consisting of other various fixed income securities 12.00% 23.00%  
Percentage of alternative investments consisting of long-short equity funds 27.00% 34.00%  
Percentage of alternative investments consisting of event-driven funds 23.00% 26.00%  
Percentage of alternative investments consisting of relative value funds 32.00% 13.00%  
Percentage of alternative investments consisting of credit funds 6.00% 13.00%  
Percentage of alternative investments consisting of hedged and non-hedged funds 12.00% 12.00%  
Percentage of alternative investments consisting of multi-strategy funds   2.00%  
Pension Benefits | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets $ 537.2    
Pension Benefits | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0    
Pension Benefits | Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 23.8 $ 24.1 23.7
Pension Benefits | Equity Securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 227.3 268.4  
Pension Benefits | Equity Securities | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 227.3 268.4  
Pension Benefits | Equity Securities | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | Equity Securities | Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | Global Equities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 103.6 129.0  
Pension Benefits | Global Equities | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 103.6 129.0  
Pension Benefits | Global Equities | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | Global Equities | Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | Non-U.S. Equities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 4.1 3.9  
Pension Benefits | Non-U.S. Equities | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 4.1 3.9  
Pension Benefits | Non-U.S. Equities | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | Non-U.S. Equities | Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | U.K. Equities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 109.1 124.8  
Pension Benefits | U.K. Equities | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 109.1 124.8  
Pension Benefits | U.K. Equities | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | U.K. Equities | Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | U.S. Large Cap Equities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 6.2 7.1  
Pension Benefits | U.S. Large Cap Equities | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 6.2 7.1  
Pension Benefits | U.S. Large Cap Equities | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | U.S. Large Cap Equities | Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | U.S. Small Cap Equities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 4.3 3.6  
Pension Benefits | U.S. Small Cap Equities | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 4.3 3.6  
Pension Benefits | U.S. Small Cap Equities | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | U.S. Small Cap Equities | Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | Fixed Income Securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 309.9 221.6  
Pension Benefits | Fixed Income Securities | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 309.9 221.6  
Pension Benefits | Fixed Income Securities | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | Fixed Income Securities | Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | Private Equity Funds [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 2.4 2.4  
Pension Benefits | Private Equity Funds [Member] | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | Private Equity Funds [Member] | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | Private Equity Funds [Member] | Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 2.4 2.4  
Pension Benefits | Aggregate Fixed Income      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 118.0 16.8  
Pension Benefits | Aggregate Fixed Income | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 118.0 16.8  
Pension Benefits | Aggregate Fixed Income | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | Aggregate Fixed Income | Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | International Fixed Income      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 191.9 204.8  
Pension Benefits | International Fixed Income | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 191.9 204.8  
Pension Benefits | International Fixed Income | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | International Fixed Income | Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | Cash and Cash Equivalents      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 34.4 109.2  
Pension Benefits | Cash and Cash Equivalents | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | Cash and Cash Equivalents | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | Cash and Cash Equivalents | Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | Alternative Investments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 36.8 111.6  
Pension Benefits | Alternative Investments | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | Alternative Investments | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | Alternative Investments | Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 2.4 2.4 0.9
Pension Benefits | Miscellaneous Funds      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 21.4 21.7  
Pension Benefits | Miscellaneous Funds | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | Miscellaneous Funds | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | Miscellaneous Funds | Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 21.4 21.7 $ 22.8
Pension Benefits | Cash and cash equivalents measured at net asset value [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 6.3 7.4  
Pension Benefits | Cash [Member] | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | Cash [Member] | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Pension Benefits | Cash [Member] | Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets $ 0.0 $ 0.0